CN101260976B - A pipeline leak detection system - Google Patents

Abstract

The invention discloses a pipeline leakage detection system, which comprises a controller and a pipeline leakage detector, wherein the controller processes and stores data in the pipeline leakage detector through a wireless technology; the pipe leakage detector further comprises: the sensor is arranged on the pipeline to be detected; an amplifier connected to the sensor; the analog-to-digital conversion module is connected with the amplifier; the main processor is connected with the analog-to-digital conversion module; the global positioning system clock synchronization control module is connected with the main processor; the wireless communication module is connected with the main processor; and the power supply module is connected with the main processor. The invention installs sensors on the outer wall of the pipeline at certain intervals, and receives sound waves generated by leakage points on the pipeline under the synchronous condition that the GPS time service error is less than 200nS, thereby realizing high-sensitivity detection of pipeline leakage and positioning of high-precision leakage sources. In addition, the device has the characteristics of low cost, small volume, light weight, easy carrying and simple and convenient operation.

Description

A pipeline leak detection system

technical field

The invention relates to the field of pipeline transportation, in particular to a pipeline leakage detection system for detecting pipeline leakage.

Background technique

Pipeline transportation is one of the five major transportation industries alongside railways, highways, water transportation, and shipping. As a special equipment, it is more and more widely used in various industrial fields such as petroleum, chemical industry, fertilizer, electric power, metallurgy, light industry, and medicine. City gas, heating systems, and almost all fluids use pressure pipes in their production, processing, transportation and use. According to a report in 1998, there are currently more than 2.3 million kilometers of long-distance pipelines in the world. The United States has 960,000 kilometers of long-distance pipelines and 1.96 million kilometers of gas pipelines in cities. According to statistics in 2002, there are more than 30,000 kilometers of long-distance pipelines in use in my country, 170,000 kilometers of urban public pipelines, and 430,000 kilometers of industrial pipelines. Although my country has a large number of pressure pipelines and a wide range of areas, there is still a big gap compared with the world's major industrialized countries. It can be expected that with the continuous development of my country's economy, as well as the construction of the West-East Gas Pipeline and large and medium-sized city gas projects, my country's The number of pipelines will increase greatly, and its safety is of paramount importance.

Among all pipelines, urban buried gas pipelines are most closely related to people's daily life, also known as urban lifelines. Due to the dangerous characteristics of explosive, flammable, and toxic transmission media in urban buried gas pipeline networks, once failure occurs, it often causes huge economic losses and even catastrophic accidents, threatening personal safety and destroying the ecological environment.

There are more than 130,000 kilometers of urban buried gas transmission pipelines in my country, 40% of which have been in operation for about 20 years, and many pipelines have entered the stage of high incidence of accidents. Due to the aging of pipelines, inevitable corrosion, natural or man-made damage and other factors, pipeline leakage accidents occur frequently, and there have been many vicious accidents caused by leakage. City gas pipes are often buried underground, making leak detection difficult. If the leakage is not detected and stopped in time, it will not only cause energy waste and economic loss, but also cause catastrophic accidents such as explosion, fire, and environmental pollution, resulting in huge loss of life and property. However, at present, our country is very backward in the detection and monitoring technology of urban buried gas pipelines. In terms of leak detection, there is no technology and equipment that can quickly determine the leaking position of buried pipelines. Once some pipelines leak, it often takes a lot of material and manpower. and time to find the leak point, which will bring accident hazards to the safe operation of the pipeline.

Contents of the invention

The purpose of the present invention is to propose the urban buried gas pipeline continuous leakage acoustic signal correlation analysis and positioning technology for the current situation, existing problems and market demand of urban buried gas pipeline leakage detection, and to develop a portable buried gas pipeline leakage point location detection device. Improve the technical level of buried gas pipeline detection, especially provide a pipeline leakage detection system for detecting pipeline leakage.

In order to achieve the above object, the technical solution of the present invention provides a pipeline leakage detection system, including a controller and a pipeline leakage detector. The controller controls the pipeline leakage detector through wireless technology, specifically collecting data Set and process, store and transmit data; the pipeline leak detector also includes: a sensor installed on the pipeline to be tested for detecting the acoustic signal of the pipeline to be tested, and converting the acoustic signal into an analog signal; an amplifier, connected to the sensor, for amplifying the analog signal into an amplified analog signal; an analog-to-digital conversion module, connected to the amplifier, for converting the amplified analog signal into a digital signal; the main processor , connected with the analog-to-digital conversion module, used for data processing and command sending of the digital signal; global positioning system clock synchronization control module, connected with the main processor, used for high-time precision data acquisition control and implementation; the wireless communication module is connected with the main processor, used to wirelessly receive the instructions of the controller and transmit them to the main processor for execution and send the data processed by the main processor to the control a power supply module, connected to the main processor, and used to provide power for the main processor.

Wherein, the sensor is a small displacement-electric signal acoustic sensor.

Wherein, the frequency bandwidth of the amplifier is within the range of 1 kHz to 250 kHz, and the variation of the gain within the passband is not more than 3 decibels.

Wherein, the main processor includes a central processing unit CPU and a complex programmable logic device CPLD, wherein the CPLD is connected to the analog-to-digital conversion module, and the CPU is respectively connected to the global positioning system clock synchronization control module, wireless Communication module, power supply module connection.

Wherein, the global positioning system clock synchronization control module includes; a global positioning module, connected to the CPU, for synchronizing the clock before detection; a real-time clock chip, connected to the CPU, for synchronizing the clock during detection .

Wherein, the wireless communication module uses CDMA wireless technology to wirelessly connect with the main processor.

Wherein, the wireless communication module GPRS wireless technology is wirelessly connected with the main processor.

Wherein, the wireless communication module adopts the third generation digital communication 3G wireless technology to wirelessly connect with the main processor.

Wherein, the power supply module is a lithium battery.

Wherein, the pipeline leak detector also includes a universal serial bus USB interface module, which is connected with the main processor, and is used to receive instructions from the controller and send them to the main processor to execute and transfer the The data processed by the main processor is sent to the controller.

The above-mentioned technical solution is only a preferred technical solution of the present invention, and has the following advantages: sensors are installed at certain distances on the outer wall of the pipeline, and the sound waves generated by the leak point on the pipeline are received under the synchronous condition that the GPS timing error is less than 200nS, thereby realizing pipeline monitoring. High-sensitivity detection of leaks and location of leak sources with high precision. The instrument can be programmed to automatically detect at any time, and inspection personnel can regularly read data from the leak locator to a general-purpose computer to determine whether there is a leak in the pipeline and the exact location of the leak in the form of intuitive graphics and numbers. Any multi-channel measuring points can be formed to detect and locate leaks in complex large-scale pipeline systems. In addition, it has the characteristics of low cost, small size, light weight, easy to carry and easy to operate.

Description of drawings

Fig. 1 is a schematic structural diagram of a pipeline leak detection system according to an embodiment of the present invention

Fig. 2 is a schematic structural diagram of another pipeline leak detection system according to an embodiment of the present invention.

Detailed ways

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

Fig. 1 is a schematic structural diagram of a pipeline leakage detection system according to an embodiment of the present invention, and Fig. 2 is a schematic structural diagram of further refinement of the pipeline leakage detection system in Fig. The detection system includes: a controller and a pipeline leak detector, and the controller processes and stores the data in the pipeline leak detector through wireless technology. The pipeline leak detector also includes: a sensor for detecting pipeline leakage, the sensor is connected with a pre-amplifier, a main amplifier, and an analog-to-digital conversion module (ADC, Analog to Digital Converter) in turn, and the analog-to-digital conversion module transmits the generated digital signal to the CPLD ( Complex PLD (Programmable Logic Device, programmable logic device), complex programmable logic device), wherein, the CPLD is connected to the pre-amplifier and the main amplifier separately to control the gain; CPLD and CPU (Central Processing Unit, central processing unit) Through the address bus and data bus connection (the single arrow solid line between the two in Figure 1 represents the address bus, and the double arrow solid line represents the data bus); the CPU is connected to the FLASH memory and RAM memory through the address bus and data bus, and through I2C The bus is connected with the real-time clock RTC (Real-Time Clock, real-time clock chip), connected with the power supply module through the I/O line, connected with the wireless communication module through the serial port 1, and connected with the GPS (Global Positioning System, global positioning system) module through the serial port 2 connect. There is a GPS antenna on the GPS module for sending and receiving signals. The wireless communication module includes a CDMA (Code Division Multiple Access) antenna, or an antenna of other wireless technologies, which is used to send and receive wireless signals. The wireless communication module exchanges data with the controller through the CDMA antenna (the dotted line in the figure indicates the wireless connection ).

Each part of the pipeline leak detection system of this embodiment will be described in detail below.

Sensors (also known as probes) convert force, displacement or speed into voltage parameters, and are composed of sensitive elements, conversion elements and conversion circuits. In the actual leak detection process, the detected signal is often a complex signal after multiple reflections and waveform transformations. The signal is received by the sensor and converted into an electrical signal. The probe gives a frequency-sensitivity curve according to a specific calibration method. This can select sensors of different types, frequencies and sensitivities according to the detection purpose and environment.

Sensors are an important part of a leak detection system. If the sensor design is unreasonable, there may be a big difference between the received signal and the expected signal, which will directly affect the authenticity of the collected data and the data processing results. In leak detection, resonant sensors and sensors with broadband response are mostly used. Resonant sensors are based on two basic assumptions: (1) the leak is a damped sine wave; (2) sound waves propagate at a fixed speed. Its assumptions imply that the shape of the acoustic wave of a propagating signal is constant beyond simple attenuation. It obtains the parameters of the leakage signal with a constant waveform and constant sound velocity.

The choice of sensor should be determined according to the measured leakage signal. The first is to understand the frequency range and amplitude range of the leakage signal under test, including possible noise signals. Then select a sensor that is sensitive to the leakage signal of interest and insensitive to the noise signal for detection. As far as the location of the leakage source is concerned, a large number of metal materials with stable structures are encountered in practical applications. The acoustic anisotropy of this type of material is small, the sound wave attenuation coefficient is small, and the frequency band ranges mostly from 25KHz to 750KHz. Therefore, resonance is used. Type sensors are more suitable, that is, acoustic sensors for small displacement-electric signals.

Amplifiers include preamplifiers and main amplifiers. The pre-amplifier is also called the pre-amplifier. The voltage of the signal output by the sensor is sometimes as low as the order of microvolts. If such a weak signal is transmitted over a long distance, the signal-to-noise ratio will inevitably decrease. A pre-amplifier close to the sensor boosts the signal to a certain level, usually 30, 40 to 60 decibels, which is transmitted to the signal processing unit. The input of the pre-amplifier is the analog signal output by the sensor, and the output is the amplified analog signal.

The output impedance of the sensor is relatively high, and the pre-amplifier needs to have the function of impedance matching and transformation. Sometimes the output signal of the sensor is too large, and it also needs the protection ability against electric shock and the recovery ability of blocking phenomenon, and has a large output dynamic range.

One of the main indicators of the preamplifier is the noise level, which should generally be less than 10 microvolts. For some special-purpose preamplifiers, the noise level should be less than 2 microvolts. The pre-amplifier generally adopts a wide-band amplifying circuit, and the frequency bandwidth can be in the range of 1 kHz to 250 kHz, and the gain variation in the pass-band does not exceed 3 decibels. Use of such amplifiers often inserts high-pass or band-pass filters to suppress noise. The pre-amplifier of this circuit structure has strong adaptability and is widely used. But there are also pre-amplifiers with tuned or charge-amplified circuit structures.

Therefore, in the leakage system, the pre-amplifier occupies an important position, and the noise of the whole system is determined by the performance of the pre-amplifier. Its function in the whole system is to improve the signal-to-noise ratio, and it must have high gain and low noise performance. In addition, it should have the advantages of convenient adjustment, good consistency, small size, etc. Since the detection t is usually in the environment of strong mechanical noise (frequency band is usually lower than 50KHz), liquid noise (usually 100KHz ~ 1MHz) and electrical noise environment, so pre-installation The amplifier should also have a certain strong anti-interference ability and the ability to exclude noise.

After the leakage signal is amplified by the pre-amplifier, a secondary main amplification is usually required to improve the dynamic range of the system. The input signal of the main amplifier is the analog signal output by the pre-amplifier, and the output is the amplified analog signal, so the main amplifier is an analog signal.

The system requires the main amplifier to have a certain gain. Like the pre-amplifier, it must have a frequency bandwidth of 1 kHz to 250 kHz, and the gain variation within the frequency bandwidth range shall not exceed 3 decibels. In addition, it must have a certain load capacity and a large dynamic range.

Usually the main amplifier supplies the DC operating current to the pre-amplifier. In order to better adapt to leakage signals of different signal amplitudes and different frequency bands, the main amplifier often has functions such as magnification adjustment and frequency band range adjustment.

Because the computing, transmission, and storage data of the microcomputer system are all digital signals, that is, logic 1 and 0 are usually said. However, in nature, continuous analog signals are often presented, so if the change of external physical quantities is to be transferred to the microcomputer for calculation or the microcomputer output instructions, the signal must be converted and processed. Therefore, after the signal is amplified by the main amplifier, it needs to be converted into a digital signal and sent to the CPLD for processing. The analog-to-digital conversion module is to convert the connected analog quantity into a discrete digital quantity. It is a process of filtering, sampling, holding circuit and quantization and encoding circuit, of which the quantization and encoding circuit is the core component. The analog signal is band-limited filtered, sample-and-hold circuit, and becomes a ladder-shaped signal, and then passes through the encoder, so that each level in the ladder-shaped signal becomes a binary code. A common analog-to-digital converter converts an input voltage signal into an output digital signal. Since the digital signal itself has no practical significance, it only represents a relative size. Therefore, any analog-to-digital converter needs a reference analog quantity as a conversion standard, and the more common reference standard is the largest convertible signal size. The output digital quantity represents the magnitude of the input signal relative to the reference signal. The most important parameter of the analog-to-digital converter is the precision of the conversion, which is usually expressed by the number of digits of the output digital signal. The more digits the converter can accurately output the digital signal, the stronger the ability of the converter to distinguish the input signal, and the better the performance of the converter.

The main processor is composed of CPU, CPLD or FPGA (Field Programmable Gate Array, field programmable gate array) or DSP (Digtal Signal Processor, digital signal processor), memory and other electronic devices and written software programs. The main processor is mainly used for data processing and command sending. For example, when to send the command to collect the signal, to issue the operation command, to process the signal data, and so on. Since the leak detector is charged by batteries, and has a relatively long service life. Therefore, in order to save power, it is necessary to choose CPU and CPLD with low power consumption.

The GPS clock synchronization control module includes a GPS module and an RTC real-time clock module. GPS provides timing and positioning functions to the world. GPS users anywhere in the world receive signals from satellites through low-cost GPS receivers to obtain accurate spatial location information, synchronized time scales and standard time. Leakage detection is divided into several sections according to the detection length. Sensors are placed at both ends of the section. The distance between each sensor is several hundred meters. Each probe is connected to a GPS synchronous clock. The GPS antenna receives the GPS clock synchronization signal and performs corresponding processing. The clock synchronization signal and absolute time stamp are obtained and sent to the acquisition device, and the acquisition device receives the processed GPS synchronization signal to synchronize the entire distributed acquisition system.

The clock synchronization mentioned here has two meanings: the synchronization of the data sampling frequency, including the pulse synchronization and phase synchronization of the sampling clock signal. Synchronization on the time axis, that is, synchronization of sampling point time labels. Only when both aspects are synchronized can it be called real synchronous acquisition.

Due to the limitation of the cable, the signal attenuation will be caused by the long distance of the synchronization technology, so it is difficult to achieve the synchronous acquisition of the clock in the order of kilometers. Therefore, in this system, the GPS technology uses satellites as the carrier of the synchronous clock signal transmission, which can be achieved Synchronous acquisition without geographical restrictions meets the synchronization requirements of this system. The master-slave clock module synchronization method is adopted, and the internal clock of one clock module is used as the reference clock of the other clock modules. Although the accuracy of synchronization can be guaranteed in theory, since the signal is sent through the cable as the carrier, after a long run, the cable's Whether self-aging and external emergencies will interfere with the signal. The transmission of the clock signal is sent wirelessly by satellite, which is rarely interfered by the signal. GPS can accurately time and ensure high-precision positioning of leakage points. After years of development and a large number of applications, GPS synchronization technology now has a relatively mature development plan, which is developed in combination with the existing NI acquisition system. For large-scale distributed The acquisition system has unique advantages, not only breaking the geographical limitations of the original clock synchronization technology, but also reducing the development cost of GPS technology while completing the same function.

The real-time clock chip RTC is the generated pulse of the clock circuit composed of the crystal oscillator and related circuits on the PC motherboard. The RTC generates a lower frequency OS (system) clock TSC through the frequency of the 8254 circuit. The system clock is incremented by one for each cpu cycle. Each time the system clock is initialized by the RTC at system startup. The 8254 also needs its own drive clock (PIT) to work. Its main function is to provide a stable clock signal for subsequent circuits. The main functions are: clock, calendar, alarm clock, periodic interrupt output, 32KHz clock output. The main performance indicators of RTC are: (1) Control mode: two-wire system, three-wire system, four-wire system. (2) Crystal oscillator: There are built-in crystal oscillator and external crystal oscillator. (3) Current consumption, time fine-tuning range, time accuracy and whether there is a TTF function.

Synchronize the clock through the GPS antenna to realize the technology of wireless and offline multi-channel asynchronous and simultaneous clock data acquisition. The core of correlation positioning is time synchronization, and the GPS antenna can solve this problem very well. Also in order to save power, GPS module and RTC real-time clock module should be used together. Because the GPS module consumes more power, the instrument uses the GPS module to synchronize the clock before each detection during the detection process. During the collection process, the RTC real-time clock module controls the collection time to achieve the effect of power saving.

The wireless communication module adopts CDMA wireless technology, GPRS (General Packet Radio Service, general wireless packet service) or 3G (3rd Generation, third-generation digital communication) wireless technology to realize wireless communication. Different wireless technologies can be selected according to different specific situations to realize the object of the present invention. For suburbs or remote mountainous areas covered only by GPRS, GPRS wireless communication technology can be used. With the maturity of 3G wireless communication technology and the reduction of cost, 3G wireless technology with better service quality can also be selected to realize wireless communication. For the pipelines laid in the city, the faster CDMA wireless technology can be preferred to realize wireless communication.

The pipeline environment for leak detection is very harsh. Since the probe needs to touch the pipeline wall, the detection distance needs to be long enough. For example, it costs 500,000 RMB to dig a hole in some cities. Moreover, after the probe is arranged, it will not be taken out for a long time, so the power supply must be sufficient and the circuit should be sufficiently power-saving. Although Zigbee wireless technology saves money and is easy to operate, it is limited due to its local area network and short measurable distance, low efficiency, and small amount of transmitted data; the transmission speed of GPRS is too slow, which increases the transmission time and consumes a lot of power. ; CDMA technology transmits speed blocks, and transmits a large amount of data, and the cost is still very low compared to GPRS. It can work in a harsh environment without manual collection, only needs to receive experimental data through the network, and can operate across provinces and countries, so CDMA wireless transmission technology is preferred. However, the wireless communication module of the present invention is not limited to the CDMA wireless transmission technology, and other wireless technologies that can realize data transmission can be applied to this module.

Since the leak detection is a long-term detection, the power module is particularly important. While saving power, it should also be equipped with a rechargeable battery with a large capacity. Considering factors such as size, capacity, service life, and price, the power supply module is composed of a charging power supply and a lithium battery pack. Lithium batteries have no memory effect and are light in weight. The rechargeable lithium battery supplies ±5V or ±15V current, allowing the lithium battery voltage to fluctuate by 50%, supporting 10-minute data collection, and one-year standby power consumption.

In addition, the controller in the pipeline leakage detection system in the embodiment of the present invention can be a personal computer, a server, and other equipment capable of data collection, processing, and setting and control of the processor. Due to the limitation of the working environment, it is preferably a notebook computer. The pipeline leakage detector in the embodiment of the present invention also includes a USB (Universal Serial Bus, universal serial bus) interface module, which is connected with the main processor. The processor is connected to the controller. At this time, the data collection and processing of the processor can be realized without the work of the wireless communication module. In addition, the processor can also be set. In addition, when the wireless communication module is abnormal, it can also be connected through the USB The interface module communicates with the controller. The pipeline leakage detection system in the embodiment of the present invention also includes a large-capacity FLASH memory, which can store at least 100 ultra-long sampling waveforms to ensure timely and safe storage of data.

The pipeline leakage detection system of the embodiment of the present invention adopts the acoustic method to detect the leakage of the buried pipeline. Sensors monitor the size and location of the leak signal. When no leakage occurs, the acoustic wave sensor obtains the background noise signal. When a leakage occurs, a low-frequency leakage acoustic signal detectable by the sensor can be generated. If more than two sensors are used for detection, the leakage source can be obtained through correlation analysis. Location.

As can be seen from the above embodiments, the pipeline leakage detection system of the embodiment of the present invention installs special sensors for high-sensitivity leak locators at intervals (usually 10-800 meters) on the outer wall of the pipeline (material is not limited), and the GPS timing error is less than 200nS Receive the sound waves generated by the leak point on the pipeline under the synchronous condition, so as to achieve the purpose of high-sensitivity detection of pipeline leakage and high-precision leakage source location. The instrument can be programmed to automatically detect at any time, and inspection personnel can regularly read data from the leak locator to a general-purpose computer to determine whether there is a leak in the pipeline and the exact location of the leak in the form of intuitive graphics and numbers. Any multi-channel measuring points can be formed to detect and locate leaks in complex large-scale pipeline systems.

The collector can run at any time during the day or night, and can be set to detect at any time to ensure the distinction between use and leakage. Workers deploy the probe placement locations on the digital map, and can obtain leak detection result analysis in the office. The pipeline leakage detection system in the embodiment of the present invention also has the advantage of being scalable, and more collectors can be added to the system to form arbitrary multi-channel measuring points. High efficiency, realize leak detection and leak location in one operation.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, some improvements and modifications can also be made. These improvements and modifications It should also be regarded as the protection scope of the present invention.

Claims (9)

1. A pipeline leakage detection system, which is used for correlation analysis and positioning of continuous leakage acoustic signals of buried gas pipelines, is characterized in that it includes a controller and a pipeline leakage detector, and the controller controls the pipeline leakage detector by wireless technology. To control, specifically to collect and set data, process, store and transmit data; when a leak occurs, it can generate a low-frequency leak sound signal that can be detected by the sensor, and use more than two sensors for detection, and obtain through correlation analysis The position of the leakage source; the pipeline leakage detector also includes: a sensor, installed on the pipeline to be tested, for detecting the acoustic signal of the pipeline to be tested, and converting the acoustic signal into an analog signal; an amplifier connected to the sensor for amplifying the analog signal into an amplified analog signal; the amplifier includes a pre-amplifier and a main amplifier; the pre-amplifier is inserted with a band-pass filter for amplifying the analog output from the sensor signal and simultaneously filter and suppress noise; the main amplifier performs secondary main amplification on the analog signal output from the pre-amplifier to improve the dynamic range of the system; the frequency bandwidth of the amplifier is within the range of 1 kHz to 250 kHz, in The variation of the gain in the passband does not exceed 3 decibels; An analog-to-digital conversion module, connected to the amplifier, for converting the amplified analog signal into a digital signal; a main processor, connected to the analog-to-digital conversion module, for processing data and sending commands to the digital signal; The global positioning system clock synchronization control module, including the global positioning module and the real-time clock chip, is connected with the main processor for the control and realization of data acquisition with high time precision, and the GPS timing error is less than 200nS; the wireless communication module is connected with the The main processor is connected to receive instructions from the controller wirelessly and transmit them to the main processor for execution and send the data processed by the main processor to the controller; The power supply module is connected with the main processor and used to provide power for the main processor. 2. The pipeline leakage detection system according to claim 1, wherein the sensor is an acoustic sensor of a small displacement-electric signal. the 3. pipeline leak detection system as claimed in claim 3, is characterized in that, described main processor comprises central processing unit CPU and complex programmable logic device CPLD, and wherein, described CPLD is connected with described analog-to-digital conversion module, The CPU is respectively connected with the global positioning system clock synchronization control module, the wireless communication module and the power supply module. 4. pipeline leakage detection system as claimed in claim 4, is characterized in that, described global positioning system clock synchronization control module comprises; A global positioning module, connected to the CPU, is used to synchronize the clock before detection; The real-time clock chip is connected with the CPU and is used for synchronizing the clock during detection. 5 . The pipeline leakage detection system according to claim 5 , wherein the wireless communication module uses CDMA wireless technology to wirelessly connect with the main processor. 6 . 6 . The pipeline leakage detection system according to claim 5 , wherein the wireless communication module is wirelessly connected with the main processor by GPRS wireless technology. 7 . 7 . The pipeline leakage detection system according to claim 5 , wherein the wireless communication module is wirelessly connected to the main processor by using third-generation digital communication 3G wireless technology. 8. The pipeline leakage detection system according to any one of claims 5-7, wherein the power supply module is a lithium battery. 9. pipeline leakage detection system as claimed in claim 9, is characterized in that, described pipeline leakage detector also comprises universal serial bus USB interface module, is connected with described main processor, is used for connection receiving described control The instructions of the processor are transmitted to the main processor for execution and the data processed by the main processor are sent to the controller. the

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